You were correct, the local EnvisaLink pw is "user"
I believe the reason I am not having success is (reading the TPI guide closely) is that the Socket connection must be persistent! The socket utility I'm using, to try and take the easy course, closes the connection with every transmission.
Guess I'll have to dust off the socket comm code I wrote last year, and use that!
Oh well, I guess I wanted something fun to do while trapped in the winter snows here.
